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Date: Tue, 4 Jan 2022 16:21:45 -0600
From: Rob Herring <robh@...nel.org>
To: David Heidelberg <david@...t.cz>
Cc: Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
Andy Gross <agross@...nel.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
~okias/devicetree@...ts.sr.ht, iommu@...ts.linux-foundation.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v2] dt-bindings: iommu: Convert msm,iommu-v0 to yaml
On Sat, Dec 25, 2021 at 08:35:55PM +0100, David Heidelberg wrote:
> Convert Qualcomm IOMMU v0 implementation to yaml format.
>
> Signed-off-by: David Heidelberg <david@...t.cz>
> ---
> v2:
> - fix wrong path in binding $id
> - comment qcom,mdp4 node example (we don't want to validate it yet)
>
> .../bindings/iommu/msm,iommu-v0.txt | 64 -------------
> .../bindings/iommu/qcom,iommu-v0.yaml | 96 +++++++++++++++++++
qcom,apq8064-iommu.yaml
At this point, I don't think we'll get a 2nd user.
> 2 files changed, 96 insertions(+), 64 deletions(-)
> delete mode 100644 Documentation/devicetree/bindings/iommu/msm,iommu-v0.txt
> create mode 100644 Documentation/devicetree/bindings/iommu/qcom,iommu-v0.yaml
>
> diff --git a/Documentation/devicetree/bindings/iommu/msm,iommu-v0.txt b/Documentation/devicetree/bindings/iommu/msm,iommu-v0.txt
> deleted file mode 100644
> index 20236385f26e..000000000000
> --- a/Documentation/devicetree/bindings/iommu/msm,iommu-v0.txt
> +++ /dev/null
> @@ -1,64 +0,0 @@
> -* QCOM IOMMU
> -
> -The MSM IOMMU is an implementation compatible with the ARM VMSA short
> -descriptor page tables. It provides address translation for bus masters outside
> -of the CPU, each connected to the IOMMU through a port called micro-TLB.
> -
> -Required Properties:
> -
> - - compatible: Must contain "qcom,apq8064-iommu".
> - - reg: Base address and size of the IOMMU registers.
> - - interrupts: Specifiers for the MMU fault interrupts. For instances that
> - support secure mode two interrupts must be specified, for non-secure and
> - secure mode, in that order. For instances that don't support secure mode a
> - single interrupt must be specified.
> - - #iommu-cells: The number of cells needed to specify the stream id. This
> - is always 1.
> - - qcom,ncb: The total number of context banks in the IOMMU.
> - - clocks : List of clocks to be used during SMMU register access. See
> - Documentation/devicetree/bindings/clock/clock-bindings.txt
> - for information about the format. For each clock specified
> - here, there must be a corresponding entry in clock-names
> - (see below).
> -
> - - clock-names : List of clock names corresponding to the clocks specified in
> - the "clocks" property (above).
> - Should be "smmu_pclk" for specifying the interface clock
> - required for iommu's register accesses.
> - Should be "smmu_clk" for specifying the functional clock
> - required by iommu for bus accesses.
> -
> -Each bus master connected to an IOMMU must reference the IOMMU in its device
> -node with the following property:
> -
> - - iommus: A reference to the IOMMU in multiple cells. The first cell is a
> - phandle to the IOMMU and the second cell is the stream id.
> - A single master device can be connected to more than one iommu
> - and multiple contexts in each of the iommu. So multiple entries
> - are required to list all the iommus and the stream ids that the
> - master is connected to.
> -
> -Example: mdp iommu and its bus master
> -
> - mdp_port0: iommu@...0000 {
> - compatible = "qcom,apq8064-iommu";
> - #iommu-cells = <1>;
> - clock-names =
> - "smmu_pclk",
> - "smmu_clk";
> - clocks =
> - <&mmcc SMMU_AHB_CLK>,
> - <&mmcc MDP_AXI_CLK>;
> - reg = <0x07500000 0x100000>;
> - interrupts =
> - <GIC_SPI 63 0>,
> - <GIC_SPI 64 0>;
> - qcom,ncb = <2>;
> - };
> -
> - mdp: qcom,mdp@...0000 {
> - compatible = "qcom,mdp";
> - ...
> - iommus = <&mdp_port0 0
> - &mdp_port0 2>;
> - };
> diff --git a/Documentation/devicetree/bindings/iommu/qcom,iommu-v0.yaml b/Documentation/devicetree/bindings/iommu/qcom,iommu-v0.yaml
> new file mode 100644
> index 000000000000..6f166c30b9ec
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iommu/qcom,iommu-v0.yaml
> @@ -0,0 +1,96 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +
> +$id: "http://devicetree.org/schemas/iommu/qcom,iommu-v0.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: Qualcomm IOMMU for APQ8064
> +
> +maintainers:
> + - Will Deacon <will@...nel.org>
> +
> +description: >
> + The MSM IOMMU is an implementation compatible with the ARM VMSA short
> + descriptor page tables. It provides address translation for bus masters
> + outside of the CPU, each connected to the IOMMU through a port called micro-TLB.
> +
> +properties:
> + compatible:
> + const: qcom,apq8064-iommu
> +
> + clocks:
> + items:
> + - description: interface clock for register accesses
> + - description: functional clock for bus accesses
> +
> + clock-names:
> + oneOf:
> + - items:
> + - const: smmu_pclk
> + - const: smmu_clk
> + - items:
> + - const: smmu_pclk
> + - const: iommu_clk
Where did this come from? It wasn't documented before.
> + reg:
> + maxItems: 1
> +
> + interrupts:
> + description: >
> + Specifiers for the MMU fault interrupts. For instances that
> + support secure mode two interrupts must be specified, for non-secure and
> + secure mode, in that order. For instances that don't support secure mode a
> + single interrupt must be specified.
minItems: 1
items:
- description: non-secure irq...
- description: ...
> +
> + "#iommu-cells":
> + const: 1
> +
> + qcom,ncb:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: The total number of context banks in the IOMMU.
> +
> +# Each bus master connected to an IOMMU must reference the IOMMU
> +# in its device node with the following property:
What property? No need to describe how the iommu binding works.
> +# A reference to the IOMMU in multiple cells. The first cell is a
> +# phandle to the IOMMU and the second cell is the stream id.
> +# A single master device can be connected to more than one iommu
> +# and multiple contexts in each of the iommu. So multiple entries
> +# are required to list all the iommus and the stream ids that the
> +# master is connected to.
Put the cells description under #iommu-cells.
> +
> +required:
> + - clocks
> + - clock-names
> + - reg
> + - interrupts
> + - qcom,ncb
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + #include <dt-bindings/clock/qcom,mmcc-msm8960.h>
> +
> + mdp_port0: iommu@...0000 {
> + compatible = "qcom,apq8064-iommu";
> + #iommu-cells = <1>;
> + clock-names =
> + "smmu_pclk",
> + "smmu_clk";
> + clocks =
> + <&clk SMMU_AHB_CLK>,
> + <&clk MDP_AXI_CLK>;
> + reg = <0x07500000 0x100000>;
> + interrupts =
> + <0 63 0>,
> + <0 64 0>;
> + qcom,ncb = <2>;
> + };
> +
> + /* mdp: mdp@...0000 {
> + compatible = "qcom,mdp4";
> + ...
> +
> + iommus = <&mdp_port0 0
> + &mdp_port0 2>;
> + };*/
> --
> 2.34.1
>
>
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